Nick Yelloly, Josh Webster and Dino Zamparelli brought the number of British racers in the GP3 Series to four when they signed on this week.
Carlos Sainz Jr and Lewis Williamson made the best of the new GP3 Series machinery in the opening test at Estoril.
Kevin Ceccon grabbed the top spot following two days of GP3 post-season testing at Jerez last week.
GP3 season favourites Mitch Evans and Conor Daly stamped their authority on the series opener at the Circuit de Catalunya in Barcelona last week.
Finnish racer Aaro Vainio topped the second and final day of the opening GP3 pre-season test at Estoril.
Swiss racer Nico Muller topped the opening day of GP3 pre-season testing at Estoril.
In the last few days, two more drivers - Marlon Stockinger and Dmitry Suranovich - have confirmed their places on the grid for the upcoming GP3 season.
British race team MW Arden became the first to fill its GP3 driver quota for the 2012 season on Wednesday.